So many questions. Can I do the auto decomp on my 98'400f? How much for parts? I have a noise coming from the motor, shimed valves to spec chanced timing chain, still have same noise.Had a guy tell me it was a key that was worn on a idler?Is this common is it a easy fix? Also the kicker is starting ti make a grinding noise if I dont push it to the front of the bike? Can I move the hot start to a bar lever on this bike? Cost is the major factor .Cant spend on a newer bike due to my son racing 50s & 65.He gets all the new bikes.I just hope to keep the old bike running good enough to chase him around.